Yamikami Kou ~Kurayami ni Dokkiri!~

Kou, a high school boy, lost his life trying to save his childhood friend Akane from being attacked by a demon and became a ghost . A sorcerer girl named Michikage Ashiya appears there , and she offers her a deal that if she becomes her dark god, she will be revived. Kou is forced to accept her deal to help Akane. Kou, who has become a dark god in the shadows, is told that if he can defeat 100 demons, he will be able to return to human, and he will fight against demons while making full use of the Shijin Goryokai.